Tube and sheet connection



May 23, V 1'944. c. F. RosENaLAD TUBE AND SHEET CONNECTION Filid Sept. 24, 1940 la .da

Militar/:ey

Patented ay 23, i944 OFFICE attain TUBE AND SHEET CONNECTION Application September 24, 1940, Serial No. 358,140 In Sweden August 16, 1939 4 Claims.

The invention relates generally to devices cornprising a tube and sheet assembly, such as tubular heat exchange apparatus or the like, for in-= stanca-and aims primarily at providing a pracn tical method of tube replacement applicable urider certain conditions with regard to the nature of the tube and sheet connection, and it also contemplates peculiar means oz tube and sheet cong nection specially designed to suit the same.

More particularly the invention is concerned` with structures having the tube and sheet cona nection made according to that known type whereby the tube is received in a sleeve or the like and joined to the saine by Welding at the juxtaposed terminal edges of cotti 'While being inserted together with the sleeve through a cor responding opening in. the to vi'nic i the sleeve is xed by welding in such a position that the joined terminals of the tuoe and sleeve will be disposed at a distance troni the adjacent side o 'the sheet.

According -to the prior art tube replacement in this type of tube and sheet connection requires removal of the sleeve from the sheet and enH changing the sleeve for a new one and is a very dicult and expensive taste `which i be effected without seriously damaging the Moreover, in the /Qiovfn constrictions the sleeve is Welded directly to either or both of the snee surfaces proper this may aise cause consid-n erable deformation of the which renders the tube replacement still more difficult The invention has for its object to provide a method or tube replacement and means of and sheet connection for structures of the charu actei referred to whereby above all the above mentioned drawbacks will be eliminated,

A further object of the invention is to provide a suitable tube and sheet connection oi' similar type for a compound sheet.

Still other objects of the invention will lee apparent from the following specification.

With this in view the method of tube replacenient according to the invention consists mainly in disintegrating the terminal joint between the tune and sleeve but leavng an end portion oi the sleeve to project 4from the adjacent side of the sheet, as before removing the tub-e from the sleeve, fitting a replacern'. nt tune in the sleeve similarly as in the case of the original tube so as to cause the juxtaposed terminal edges of both to be longitudinally spaced in proper relationship, and welding the replacement tube to the sleeve at said terminal edges.

In practice the step of disintegrating the terminal joint between the tube and sleeve is suitably carried out by cutting o the joint proper while having the longest possible end portion the sleeve to project from the sheet.

Further the terminal joint between the tube and the sleeve is preferably eifecteo by means of fusion Welding Without using any additional material, be it in the case of the original or the replacement tube.

The method according to the invention requires of course that a suilicient marginal portion of the tube and sleeve is extending through the opening in the so that ater cutting off terminal ,teint there will remain an ample end portion of the sleeve extending as befor:l in order that this ooeration as Well the welding tix-e replacement to the sleeve may be performed damaging the sheet. lit is ob viens that dimensioning 'he projecting marginal portion of the tube and sleeve accordingly it is rendered possible to successively carry out er of tube replacements in the Ilianand natorally this method is well le with any iznown tube and sheet connection of the type in question only it be adapted therefor in respect mentioned.

Thus, invention provides a most practical oi tuoe replacementwhlcii. be ernplotfed with-ont doi' ge to the sheet 'le one W aine sleeve.

` o batter ii as; of type of tube ns in accordance with tue inlen, some embodiments thereof viil oe illusexample in the accompanying l diode l section a connection sub 4s known in the art laut more y designed in accordance with the inion. l; 2 slice-7s in axial section a modification of sii iler connection according to the invention. I gs. 3 and si show in axial section different embodiments of a connection for a compound sneet according to the invention.

Referring novi to the drawing in the onnection shown b.' Fig, l the tube Ai has an portion inserted through a correpcnding opening in the sheet B1 while received in a sleeve C1 fitted into the opening so that the juxtaposed terminal edges of both will be disposed at a dis tance from the adjacent side of the sheL4 the tune being joined to the sleeve by welding at th terminal, as designated by X1, anc'. the sleeve being fixed to the sheet at either side thereof, e; designated by Y1.

According to the invention but in contrast to former practice it is thereby required that the marginal portion of the tube and sleeve which will thus be extending from the sheet at the side adjacent the terminal has a rather considerable length in order to suit the method of the replacement disclosed above. Then it will normally be the easiest thing to carry out the tube replacement by cutting oi the terminal joint between the tube and sleeve at Xi and S forth, but difculties may still sometimes occur in case the sheet be deformed or the material be subjected to interior tension or stresses, as may be caused by the welding operation at the joint Y1.

However, the iastmentioned disadvantage is substantially eliminated in the connection shown by Fig. 2 which di'ers in that e. portion of the sheet Bz is formed to project fromV the sheet Bz as a cuff b2 around the opening,r in the sheet at the side opposite the terminal of the tube Az joined to the sleeve C2 at X2 while ei'nbracin.y an end portion 0i the sleeve C2 extending at that side, the sleeve Cs being secured te the cuil m at the juxtaposed terminal edges ci' both, as indicated by Y2. In this connection the tube Az, the sleeve C: and the cuff bei are preferably spaced relative to each other in the longitudinal direction so that the juxtaposed terminal edges of the tube and sleeve and of the sleeve and cuff substantially coincide while the respective ter minal joints X: and i12 are effected by fusion Welding without using any additional material.

Fig. 3 shows a connection for a compound sheet comprising a relatively thick body plate B3 covered at each side by a relatively thin facial plate b. This connection .is substantially similar to that shown in Fig. 1 but includes a separate cud-like member da provided to project from the sheet at the side adjacent the terminal o the tube A3 around the opening in the sheet 'while embracing the end portion of the sleeve Cs ein tending at that side. The member da is secured to the facial plate at c: while the 'sleeve Ca is secured on one side to said member da at Xa and on the other side to the facial plate located at the opposite side of the sheet, as indicated by Ys. Thereby the joint between the tube and the sleeve coincides with the `ioint between the sleeve and the cuff-like member, as at Xa. By virtue of this arrangement the sleeve may be removed and replaced, should so be required'by disintegrating only two joints, namely at Xs and Ys, and thus less damage will be molde to the sheet in the course of such operation than ii' the sleeve should be directly xcd to both sides of the sheet.

Fig. 4 shows another connection for a similar compound sheet B4 with the body plate B and the facial plates lg. this connection having more resemblance to the one shown in Fis. 2. Thus, in this case each of the facial plates b has a portion formed to a cui? b4 projecting from the sheet around the opening therein, one at either side. while embracing a portion of the sleeve c4 extending at the respective side. The sleeve is secured by welding io both these cuii's ba, the

cuff located at the side adjacent the terminal of the tube having the terminal united with the periphery of the sleeve, as at 24. and the cuff located at the opposite side having the terminal united with the juxtaposed terminal of the sleeve as at Yi, while m4 indicates the joint between the tube and the sleeve. This arrangement lserves to avoid welding direct at the sheet suraged, as stated above. Preferably all joints are effected by fusion Welding without using any additional material Wherever this is possible, in this case as in all the others.

It is understood that further changes may be made vin the connection means without deviating from the scope of the invention and that the invention is not limited otherwise than by the appending claims. i

Thus, what I claim and desire to have secured by Letters Patent is:

1. In a tube and sheet connection for a sheet having an opening, a tube with an end portion thereof projecting through said opening, a sleeve tted in said opening and received over said end portion of said tube so that the juxtaposed terminal edges of both are disposed at a distance from one side of the sheet, said tube and said sleeve being joined at said terminal edges by welding, said distance being sufficient so that said sleeve may be shortened repeatedly to permit the repeated removal and repiacement of the tube, and a cui! consisting of a portion of the sheet projecting from the opposite` side o the sheet from which the end portion of said tube projects, and extending around said opening while embracing an end portion of the sleeve ex tending at said opposite side, said sleeve being secured to said cuff by welding at the juxtaposed terminal edges of both.

2. AIn a tube and sheet connection for a coinpound sheet comprising a relatively thick body plate covered at each side by a relatively thin facial plate of dierent material than the body plate and having an opening through the whole, a tube with an end portion thereof inserted through said opening, a sleeve fitted in said opening and received over said end portion of said tube so that the juxtaposed terminal edges ci both are disposed at a distance from one side of the sheet, said tube and said sleeve being ioined by welding at said terminal edges, said distance being sufiicient so that said sleeve may be shortened repeatedly to permit the repeated removal and replacement of the tube,"and a culi' consisting of a portion of the facial plate located at the opposite side of the sheet, said cud projecting from said opposite side around said opening and embracing an end portion of said sleeve extending at said opposite side, said sleeve being secured by welding to said cui at the juxtaposed terminal edges of both and to the facial plate located at said one side of the sheet.

3. In a tube and sheet connection for a compound sheet comprising a relatively thick body plate covered at each side by a relatively thin facial plate of different material from the body plate and having an opening through the whole. a tube with an. end portion thereof inserted through said opening, a sleeve fitted in said openlng and received over said end portion of said tube so that the juxtaposed terminal edges of both are disposed at a distance from one side of the sheet, said tube and said sleeve being joined by welding at said terminal edges, said distance being suiiicient so that said sleeve may be shortened repeatedly to permit the repeated removal and replacement of the tube, a separate cuir-like member provided at said one side of the sheet so as to project from that side around said opening and embracing the end portion of said sleeve extending at the same side, said member being fixed by Welding to the facial plate located at said one side of the sheet, and said sleeve being secured by welding both to said member and to the facial plate located at the opposite side of the sheet.

4. In a tube and sheet connection for a compound sheet comprising a relatively thick body plate covered at each side by a relatively thin facial plate of different material than the body plate and having an opening through the whole, a tube with an end portion thereof inserted through said opening, a sleeve fitted in said opening and surrounding said end portion of said tube so that the juxtaposed terminal edges of the tube and sleeve are disposed at a. distance from one side of the sheet, said tube and said sleeve being joined by fusion welding at said terminal edges,

said distance being sumcient so that said sleeve may be shortened repeatedly to p'ermlt the re peated removal and replacement of the tube, and a cuff consisting of a portion of the facial plate located at the opposite side of the sheet, said cuil projecting from said opposite side around said opening and surrounding an end portion of said sleeve extending at said opposite side, said sleeve being secured by `fusion welding to said cuff at the juxtaposed terminal edges thereof. and being secured by welding to the facial plate located at said one side of the compound sheet, there being no additional material used in eii'ecting either of the fusion welds.

CURT FREDRIK ROSENBLAD. 

